Patent US2561793A successfully refreshed from Google Patents.
US2561793A
Expired / Lapsed
US
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Incandescent gas burner for furnace wall
Assignee: Selas Corp of America
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Filing: 1948-10-26
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Granted: 1951-07-24
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Expires: 1968-10-26
Abstract
No abstract record available.
Inventors
- 👤 Alfons A Furczyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:51
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/12; F23D14/125
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |